"The Marry Prankster" – When the gang pranks Max into thinking he won a big lotto jackpot, he vows revenge when they least suspect it. Everyone dreads what might happen next; Alex decides to cut a deal with Max to avoid payback . . . while Max's plotting gets in the way of the big event Penny's been waiting for, a proposal from Pete (guest star Nick Zano). Meanwhile, Brad gets a new job as a CFO, but Jane is not amused when she learns the title is Chief Fun Officer and that Brad is working at a kids' gym, on "Happy Endings," SUNDAY, JANUARY 20 (10:01-10:31 p.m., ET) on the ABC Television Network.